<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    @font-face {
      font-family: 'icomoon';
      src: url('fonts/icomoon.eot?jtaqgu');
      src: url('fonts/icomoon.eot?jtaqgu#iefix') format('embedded-opentype'),
        url('fonts/icomoon.ttf?jtaqgu') format('truetype'),
        url('fonts/icomoon.woff?jtaqgu') format('woff'),
        url('fonts/icomoon.svg?jtaqgu#icomoon') format('svg');
      font-weight: normal;
      font-style: normal;
      font-display: block;
    }

    div {
      position: relative;
      width: 200px;
      height: 35px;
      border: 1px solid red;
    }
    div::after {
      position: absolute;
      top: 10px;
      right: 10px;
      font-family: 'icomoon';
      /* content: ''; */
      content: '\e900';
    }
  </style>
  <body>
    <div></div>
  </body>
</html>
